Photographic or cinematographic film.



L. GAUMONT.

PHOTOGRAPHIC 0R CINEMATOGRAPHIG FILM.

APPLICATION FILED JULY 8. 19M.

Ll fi o Patented N0v.9,1915.

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LEO-N eaumonr, or PARIS, FRANCE.

PHOTOGRAPHIC R ClINEMATOG-BAPHIG FILM.

Specification of Letters Patent.

Patented Nov. 9, i915.

' Application filed July 8, 1914. Serial No. 850,530.

To all whom it may concern:

Be it known that I, LEON GAUMONT, of

' Paris, France, have invented certain new and usefulflmpfovements in Photographic or Cinematographic Films, of which the following is a specification.

For the manufacture of photographic and cinematographic films (known as non-inflammable or' safety films), various incombustible carriers have been employed. Some of these have had to be abandoned, in spite of their being much cheaper than films of alter or affect the carrier in being spread thereon, whereas gelatin coatings contain water, which affects certain carriers, such as viscose, when spread thereon.

An embodiment of, the invention is illustrated in Figure 1 of the accompanying drawing, which figure illustrates a sensitized film in longitudinal section. Fig. 2 is a like View of another embodiment, and Fig. 3 is a like View of still another embodiment.

or represents a sheet or film of viscose or the like (the thickness of which is much exaggerated), and b a very thin layer of collodion (also much exaggerated) applied on' one. face of the layer a, the collodion layer being sensitized by well-known means.

As the layer or coating of sensitized collodion thus applied on the viscose is extremely thin, it permits of running the film ve rapidly through the developing, fixing an washing baths, and of performing these photographic operations in such a short lodion permits the photographic pictures to be produced, in such a short time that the moisture cannot attack the viscose in this time. Moreover, although the employment of collodion reduces to a minimum the period of contact with thewater, the carrier can also be llghtly impermeabilized by a super ficial treatment. As shown in Fig. 2, the

carrier (1. may have applied to each side thereof a layer of impermeable material a,

as for instance, a suitable varnish, as a varnish with a celluloid base, over one of which layers the sensitized collodion layer 6 is applied. Or, as illustrated in Fig.3, the carrier a may have a layer of impermeable material a on one side and a layer of the sensitized collodion b on the other. Under these conditions, the passage of the film through the baths above mentioned has no efiect upon the carrier of viscose or similar material. It may also be remarked that the employment of the collodion forming a coating for the viscose carrier allows of obtaining pictures of much greater fineness andtransparency than is generally obtained by gelatino bromid or gelatino chlorid. Claims:

1. A film comprising a layer of atranspar ent, flexible incombustible carrier, and avery thin layer of sensitized collodion, allow- 'ing the developing, washing and fixing to period of time that the action of the water on the carrier (viscose for example) is reduced to the utmost possible extent. .By this combination of an incombustible and cheap carrier, such as viscose,with a thin superficial coating of collodion, the draw- I back of viscose, viz: that of swelling and becoming distorted, is avoided, because the colbe. so rapidly efi'ected that the film does not have time to be appreciably affected by the water present during treatment.

.2. A film comprising a layer of viscose, and a very thin layer of sensitized collodion,

allowing the develo ing, washing and fixing to be so rapidly e ected that the film does. not have time to be appreciably affected by the water present during treatment.

3. A film comprising a layer of a transparent, flexible incombustible carrier, and-a very thin layer of sensitized collodion, allowing the developing, washing and fixing to be so rapidly efl'ected'that thefilm does not have time to be appreciably'aflected by thewater present during treatment, said carrier having an impermeable coating.

4. A photograph film, comprising a transparent, 'flexible non-inflammable body or base, an impervious coating, and an cute;

sensitized collodion coating.

5. A photographic film, comprising a In witness whereof, I have hereunto transparent, flexible non-inflammable body signed my name in the presence of tWo sub- 10 oroaie anldll a sensitized igfllodioncoating.v scribing Witnesses.

. p otograp ic m, comprising a 5 transparent, flexible non-inflammable body LEON G or base, an imperizious coating on one side, Vitnessesz' I and an outer sensitized collodion coating CHAS. P. PREssLY, on the other side. I RENI BAROLY, 

